Natrona County, WY

ZIP 82604

In ZIP 82604, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Casper, City Of meets every EPA legal limit; 4 contaminants are above health goals, led by lithium at 3.9× the USGS health-based screening level.
• Closer to Superfund sites than 0% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Excal Inc. (68%), mostly nickel.
• Fine particles (PM2.5) average 4.5 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 20,547 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 82604

• Superfund sites nearbyA
• Factories and industrial sitesA to F
• Oil and gas wellsA to C
• Parks and nature nearbyA to C
• Air qualityA
• Drinking water qualityA to C
• Pesticide useC to F
• Neighborhood health statusB to F
• Past wildfire impactsA to D
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsC to F

Based on 11 census tracts · compiled October 25, 2026 · how each grade works and its sources

Loading the full report, with every source…